docs: def detach_zone(organization_id_or_slug):
      '''Detach the zone of a given <organization>.'''
      organization = Organization.objects.get_by_id_or_slug(
          organization_id_or_slug)
      if not organization:
          exit_with_error(
              'No organization found for {0}'.format(organization_id_or_slug)
          )
      log.info('Detaching {organization} from {organization.zone}'.format(
               organization=organization))
      organization.zone = None
      organization.save()
      log.info('Done')